Variation exceeding 15% (Clause 52.3 Fidic) Looking for an equal Clause in CCDC 2 (Canadian Construction Contract)

Hi All

Anyone who is conversant with CCDC 2 (Canadian Construction Contracts) should be able to help me out. 

Question

I am looking for an equivalent of FIDIC Clause 52.3 (Variation Exceeding 15%) in CCDC 2

FIDIC Clause 52.3

allows the Contractor and Engineer to discuss and agree a lump sum addition or deduction to the Contract Price when the additions/deductions are more than 15% of the "Effective Contract Price"